New, cleaner package repository structure.

Package repositories now look like this:

    top-level-dir/
        repo.yaml
        packages/
            libelf/
                package.py
            mpich/
                package.py
            ...

This leaves room at the top level for additional metadata, source,
per-repo configs, indexes, etc., and it makes it easy to see that
something is a spack repo (just look for repo.yaml and packages).

var/spack/repos/builtin/packages/flux/package.py

@@ -0,0 +1,36 @@
+from spack import *
+import os
+
+class Flux(Package):
+    """ A next-generation resource manager (pre-alpha) """
+
+    homepage = "https://github.com/flux-framework/flux-core"
+    url      = "https://github.com/flux-framework/flux-core"
+
+    version('master', branch='master', git='https://github.com/flux-framework/flux-core')
+
+    # Also needs autotools, but should use the system version if available
+    depends_on("zeromq@4.0.4:")
+    depends_on("czmq@2.2:")
+    depends_on("lua@5.1:5.1.99")
+    depends_on("munge")
+    depends_on("libjson-c")
+    depends_on("libxslt")
+    # TODO: This provides a catalog, hacked with environment below for now
+    depends_on("docbook-xml")
+    depends_on("asciidoc")
+    depends_on("python")
+    depends_on("py-cffi")
+
+    def install(self, spec, prefix):
+        # Bootstrap with autotools
+        bash = which('bash')
+        bash('./autogen.sh')
+
+        # Fix asciidoc dependency on xml style sheets and whatnot
+        os.environ['XML_CATALOG_FILES'] = os.path.join(spec['docbook-xml'].prefix,
+                                                       'catalog.xml')
+        # Configure, compile & install
+        configure("--prefix=" + prefix)
+        make("install", "V=1")
+